View type is not documented, should be added here:
https://docs.magnolia-cms.com/product-docs/6.2/Apps/App-configuration/Action-definition.html#_general_action_definition_classes
3 view types, version and view are read only:
https://git.magnolia-cms.com/projects/PLATFORM/repos/ui.pub/browse/magnolia-ui-framewor[…]nfo/magnolia/ui/contentapp/detail/ContentDetailSubApp.java
used in persona show versions action
It’s used e.g. here, the main config is here.